Some discussion about judging shades of gray prompted me to overlay a Kodak
grayscale chart onto John's comparison shot with the 3rd year herring gull.

You can  see this here:

http://www.flickr.com/photos/haans42/

Then use the chart on pp 26 of Howell and Dunn.  If the Herring gull looks
lighter than the values on the H&D chart shift everything the same amount
lighter.  If darker shift everything in that direction.

To me the result matches what I thought I saw in the field Saturday.

Hope everyone is having a great holiday.  Briskett on BBQ and time to kill
while it cooks

Haans

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